本方案设计的频率计由衰减电路、宽带通道放大器、整形电路、FPGA测量模块、STM32单片机最小系统组成。设计了一个放大倍数为40 d B的两级宽带通道放大器,将10 m V(有效值)的信号放大到1 V(有效值)左右。第一级使用OPA847实现了26 d B...本方案设计的频率计由衰减电路、宽带通道放大器、整形电路、FPGA测量模块、STM32单片机最小系统组成。设计了一个放大倍数为40 d B的两级宽带通道放大器,将10 m V(有效值)的信号放大到1 V(有效值)左右。第一级使用OPA847实现了26 d B的放大,第二级使用THS3201实现了14 d B的放大。当被测信号幅度较大时,使用衰减网络将被测信号衰减到10 m V左右。放大后的信号整形后产生相同频率的方波信号,使用Cyclone IV FPGA芯片实现等精度法测量频率、时间间隔和占空比。测量结果通过串口传给STM32单片机系统进行相关处理和显示。展开更多
In this paper, a fully integrated CMOS receiver frontend for high-speed short range wireless applications centering at 60GHz millimeter wave （mmW） band is designed and implemented in 90nm CMOS technology. The 60GHz ...In this paper, a fully integrated CMOS receiver frontend for high-speed short range wireless applications centering at 60GHz millimeter wave （mmW） band is designed and implemented in 90nm CMOS technology. The 60GHz receiver is designed based on the super-heterodyne architecture consisting of a low noise amplifier （LNA） with inter-stage peaking technique, a single- balanced RF mixer, an IF amplifier, and a double-balanced I/Q down-conversion IF mixer. The proposed 60GHz receiver frontend derives from the sliding-IF structure and is designed with 7GHz ultra-wide bandwidth around 60GHz, supporting four 2.16GHz receiving channels from IEEE 802.1lad standard for next generation high speed Wi- Fi applications. Measured results show that the entire receiver achieves a peak gain of 12dB and an input 1-dB compression point of -14.SdBm, with a noise figure of lower than 7dB, while consumes a total DC current of only 60mA from a 1.2V voltage supply.展开更多
Mainly due to its implementation simplicity, the non-coherent Ultra-Wide Band (UWB) receiver is attractive for lower data rate applications, which gains much attention again in recent years. In this paper, a General L...Mainly due to its implementation simplicity, the non-coherent Ultra-Wide Band (UWB) receiver is attractive for lower data rate applications, which gains much attention again in recent years. In this paper, a General Likelihood Ratio Test (GLRT) based non-coherent receiver on UWB Pulse-Position-Modulation (PPM) signal in multipath channels is derived, and a novel structure is proposed as well. Subsequently, the closed-form expressions of asymptotic error-rate performance related to the non-coherent receiver are also derived and verified.展开更多
A novel distributed packet routing algorithm for Low Earth Orbit (LEO) satellite networks based on spiderweb topology is presented. The algorithm gives the shortest path with very low computational complexity and with...A novel distributed packet routing algorithm for Low Earth Orbit (LEO) satellite networks based on spiderweb topology is presented. The algorithm gives the shortest path with very low computational complexity and without on-board routing tables, which is suitable and practical for on-board processing. Simulation results show its practicability and feasibility.展开更多
文摘本方案设计的频率计由衰减电路、宽带通道放大器、整形电路、FPGA测量模块、STM32单片机最小系统组成。设计了一个放大倍数为40 d B的两级宽带通道放大器,将10 m V(有效值)的信号放大到1 V(有效值)左右。第一级使用OPA847实现了26 d B的放大,第二级使用THS3201实现了14 d B的放大。当被测信号幅度较大时,使用衰减网络将被测信号衰减到10 m V左右。放大后的信号整形后产生相同频率的方波信号,使用Cyclone IV FPGA芯片实现等精度法测量频率、时间间隔和占空比。测量结果通过串口传给STM32单片机系统进行相关处理和显示。
基金supported by National 973 Program of China 2010CB327404National 863 Program of China 2011AA010202+2 种基金National Science and Technology Major Project of China 2012ZX03004004National Natural Science Foundation of China under grants 61101001,and 61204026Tsinghua University Initiative Scientific Research Program
文摘In this paper, a fully integrated CMOS receiver frontend for high-speed short range wireless applications centering at 60GHz millimeter wave （mmW） band is designed and implemented in 90nm CMOS technology. The 60GHz receiver is designed based on the super-heterodyne architecture consisting of a low noise amplifier （LNA） with inter-stage peaking technique, a single- balanced RF mixer, an IF amplifier, and a double-balanced I/Q down-conversion IF mixer. The proposed 60GHz receiver frontend derives from the sliding-IF structure and is designed with 7GHz ultra-wide bandwidth around 60GHz, supporting four 2.16GHz receiving channels from IEEE 802.1lad standard for next generation high speed Wi- Fi applications. Measured results show that the entire receiver achieves a peak gain of 12dB and an input 1-dB compression point of -14.SdBm, with a noise figure of lower than 7dB, while consumes a total DC current of only 60mA from a 1.2V voltage supply.
文摘Mainly due to its implementation simplicity, the non-coherent Ultra-Wide Band (UWB) receiver is attractive for lower data rate applications, which gains much attention again in recent years. In this paper, a General Likelihood Ratio Test (GLRT) based non-coherent receiver on UWB Pulse-Position-Modulation (PPM) signal in multipath channels is derived, and a novel structure is proposed as well. Subsequently, the closed-form expressions of asymptotic error-rate performance related to the non-coherent receiver are also derived and verified.
文摘A novel distributed packet routing algorithm for Low Earth Orbit (LEO) satellite networks based on spiderweb topology is presented. The algorithm gives the shortest path with very low computational complexity and without on-board routing tables, which is suitable and practical for on-board processing. Simulation results show its practicability and feasibility.
